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Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks

Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)
StateArizona
NameCretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks
Geologic ageLate Jurassic to Cretaceous
Original map labelKJs
Primary rock typeconglomerate
Secondary rock typesandstone
Other rock typesarenite; argillite; limestone; mudstone; sedimentary breccia; shale; siltstone; wacke; andesite; dacite; intermediate metavolcanic rock; meta-conglomerate; metarhyolite; phyllite; quartz-feldspar schist; rhyolite; schist; landslide; calcarenite; evaporite
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Minor
Sedimentary > Clastic > Siltstone (Bed)
Incidental
Metamorphic > Schist (Greenschist)
Metamorphic > Quartzite (Greenschist)
Metamorphic > Phyllite (Greenschist)
Metamorphic > Metavolcanic (Greenschist)
Metamorphic > Metasedimentary (Greenschist)
Metamorphic > Marble (Greenschist)
Metamorphic > Greenstone (Greenschist)
Metamorphic > Argillite (Greenschist)
Metamorphic > Schist (Amphibolite, epidote-amphibolite)
Metamorphic > Quartzite (Amphibolite, epidote-amphibolite)
Metamorphic > Phyllite (Amphibolite, epidote-amphibolite)
Metamorphic > Metavolcanic (Amphibolite, epidote-amphibolite)
Metamorphic > Metasedimentary (Amphibolite, epidote-amphibolite)
Metamorphic > Marble (Amphibolite, epidote-amphibolite)
Metamorphic > Greenstone (Amphibolite, epidote-amphibolite)
Metamorphic > Argillite (Amphibolite, epidote-amphibolite)
Sedimentary > Chemical > Evaporite (Bed)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-mafic-alkaline (Dike or sill)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Dike or sill)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-dacite (Dike or sill)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-andesite (Dike or sill)
Igneous > Volcanic > Alkalic-volcanic (Volcaniclastic)
Igneous > Volcanic > Alkalic-volcanic (Pyroclastic)
Igneous > Volcanic > Alkalic-volcanic (Flow)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Volcaniclastic)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic)
Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic)
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Sedimentary > Clastic > Sandstone (Calcareous)
Sedimentary > Clastic > Siltstone (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Sedimentary-breccia (Bed)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow)
Map references
Richard, S. M., Reynolds, S.J., Spencer, J. E., and Pearthree, P. A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.
Unit references
Richard, S. M., Reynolds, S.J., Spencer, J. E., and Pearthree, P. A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.
Dickinson, W.R., Fiorillo, A.R., Hall, D.L., Monreal, R., Potochnik, A.R., and Swift, P.M., 1989, Cretaceous strata of southern Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society
Tosdal R.M., Haxel, G.B., and Wright, J.E., 1989, Jurassic geology of the Sonoran Desert region, southern Arizona, southeastern California, and northernmost Sonora: Construction of a continental-margin magmatic arc, in Jenney, J.P., and Rey
Geographic coverageCochise - La Paz - Maricopa - Pima - Pinal - Santa Cruz - Yuma

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